It has fixed all my machines and will hopefully help others. The below fix was recommended to me by a wise old IT JOAT. I (and many, many others) have run into this on new Windows 7 SP1 installs from Microsoft media, newly arrived laptops with Win 7 SP1+ preloads, and laptops and desktops running ‘7 SP1 that were previously fully updated. Windows Update can spin on “checking for updates…” for hours – or even days.
Update hangs? Boy howdy! This has become a real nightmare.